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I had the same problem with "Great Stuff". I was going to do a mod but it stayed spongy. I used some expanding foam in a house mod a couple years ago and that got as hard as a rock and the expansion was from 1/4" at application to over 2" when cured. The problem I is don't remember the name. But Great Stuff is not that great for our application but there are others. I'm going to pick up some other brands until I find something suitable.
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